I'm just wondering if anyone knows the answer to this question. I use Electrum and Blockchain as my 2 primary wallets. Electrum often takes an hour or more to complete a transaction and sometimes it says payment sent but the payment was never actually sent and takes days to return to the wallet. Blockchain, on the other hand, is instantaneous and when it says the payment is sent it immediately shows up in my bitcoin exchange account and I can cash it out to my bank account within a few minutes. Why is there such a huge difference between Electrum and Blockchain?